Expansion-anchor



J. KENNEDY.

EXPANSION ANCHOR.

APPLICATION FILED OCT. 10. 1018.

1 20,623. Patented Nov. 4, 1919.

SAT

JOSEPH KENNEDY, 0F RICHMOND HILL, NEW YORK, ASSIGNOB To J. EDWARD OGDEN,OF MOUNTAINVILLE, NEW YORK.

EXPANSION-ANCHOR.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Original application filed June 16, 1917, Serial No. 175,058. Dividedand this application filed October 10,

To all whom it may concern:

lie it known that I, JOSEPH KENNEDY, a citizen of the United States ofAmerica, and a resident of Richmond Hill, Queen's county, and State ofNew York, have invented certain new and useful Improvements inExpansion-Anchors, of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

My invention relates to expansion anchors for bolts and its object is toprovide a simple and ineXpensive structure by means of which bolts maybe securely fastened to material of such character that their threadswill not satisfactorily engage therewith. lVIorc specifically, itsobject is to provide a structure which under longitudinal pressure willcollapse longitudinally along predetermined transverse lines to therebyexpand outwardly against the wall of a hole in which it is placed andcontract inwardly against the bolt it is designed to hold.

This application is divided from a copending; application for patentSerial No. 175,058 filed June 16,1917, and relates specifically to thetype of anchorage disclosed therein, in which the anchorage structure isweakened along longitudinal lines in order to facilitate its collapse inoperation.

In order that my invention may be thoroughly understood I will nowproceed to describe the same in the following specification, and thenpoint out the novel features thereof in appended claims.

Referring to the drawings: 4 Figure 1 is a sectional longitudinalelevation of an expansion anchor made according to and embodying myinvention shown inserted in hole before expansion and with a bolt inposition.

Fig. 2 is a similar View of the same parts in the positions they assumeafter expansion.

Fig. 3 is an elevation of the anchor shown in the preceding figures.

Fi at is an elevation of an anchor of modidied construction which alsoembodies this invention.

Fig. 5 is an elevation of a bolt with the anchorage member of Fig. eshown in section, and illustrates the way in which this form of thedevice is used.

Fig. 6 is a sectional longitudinal elevation of an expansion anchor of amodified form Serial No. 257,541.

tube threads 12 are rolled intotube in such a way as to reduce thediameter of the tube at this part and of such size and pitch as to fitthe threads of the bolt. The collapsing of the tube is facilitated byproviding longitudinal weakenings such as the slots 36. These are shownextending completely through the walls and for a greater part of thelength of the anchor, a structure of this kind being readily formed fromsheet metal in a well known manner.

' The anchor may be made in more than one piece as shown in Fig. %i, inthis case of two similar pieces 37 and 38. Such parts may be stan'ipedreadily from sheet metal.

Before describing specifically the structure illustrated in the otherfigures of the drawings, I will point out the manner in which thisdevice is used. A. hole is drilled in a w vll 15, for example, ofsufficient depth and diameter to receive the tube as shown in Fig. 1. 16is an object which is to be fastened to the wall. The bolt 10 is passedthrough the object and through the tube into the threads 12. Tighteningthe bolt will put longitudinal pressure upon the tube which willcollapse under this pressure along lines predetermined by thecreases 13and 1e. This will increase the crimps in the metal which will thus havea tendency to fold up like an accordion. The inward displacement of themetal at the lines 13 is of course limited by the shank of the bolt, andthis limitation will assist in forcing the metal of the tube at thelines Ll into the wall of the hole Thus a firm anchorage with the wallis formed and at the same time that tube is crushed in against the boltso that the latter has no clearancce and is incapable of lateralmovement which might in time loosen the anchorage. The parts will haveassumed some such positions as those illustrated in Fig. 2.

In the structure shown in Fig. 6, the tube 11 is made of thicker metal.It is constructed with a clearance hole 20 for the bolt 10. Its innerend is of smaller diame- 7 ter and is PI'OVlflGCl'Wltll cast-or cutthreads 21. Art spaced intervals grooves 22*are cut transversely throughthe inner surface of the bore 20. Between these rooves others designated23 are (full in the outer surface. These. grooves 22 and 23 are ofsuilicient depth, dependent upon the kind of metal I-of which the tubeis made to insure l'tS buckling in and out when subjected tolongitudinal pressure produced by turning the bolt in the threads 21. vI

The parts'37 and 38 of Figs. 4; and 5 are transversely corrugated. Whenthese are used they are placed over the shank 30 of a bolt, between itshead 31 and the object 16 which is moved toward the bolt head 81by'thenut32. r

I intend nolimitations other than those imposed by the appended claims.

W' hat I claim is:

1. A bolt anchor comprising a member having longitudinally separatedparts, each provided with means for causing said member when subjectedto longitudinal pressure, to be crimped onto a'bolt and against the wallof a hole in which it isinserted.

A bolt anchor comprising a member having longitudinally separated partseach provided with spaced laterally contracted and expanded portions andadapted when subjected to longitudinal pressure to be crimped onto abolt and against the wal of a hole in which it is inserted.

3. A bolt anchor comprising a tubular member having a slotted portionthrough a part of its length adapted to collapse longitudinally andexpand inwardly and outwardly when subjected to longitudinal pressure.

4;. A bolt anchor comprising a tubular member having a longitudinalslotted portion provided with transverse corrugations and adapted tocollapse longitudinally and Copies of thispatent may be obtained forexpand inwardly and outwardly when sub jet ted to longitudinal pressure.7

5. A bolt anchor comprising a tubularmember having a longitudinallysloted portion provided with equally spaced means thereon for causingsaid slotted portion to become crimped at equally spaced trans verselines when subjected to longitudinal pressure; g

6. A' bolt anchor comprising a tubular member provided nearone end withthreads adapted to receive the threads of a boltinserted through thetube,'said member having a longitudinally slotted portion, and means forcausingsaid member when subjected to longitudinal press'ure'to becrimped onto the bolt and against the wallsoi" a hole in which it isinserted. 7. A bolt anchor comprising a tubular member provided near oneend with threads adapted to receive thethreads oi a bolt insertedthrough the tube, said member hav-a ing a longitudinally slotted,portion pro.-

vided with equally spaced. means thereon pressure,

In witness whereof, have hereunto set my hand. this 7th day of October,1918.3

JOSEPH KENNEDY.

five cents each, by addressing the flbommis s ion'er OfIate'nts,Washington, D. G. i 1

